Выполните действия:
1) $3\frac{10}{17} + 4\frac{4}{17}$;
2) $9\frac{16}{25} - 2\frac{8}{25}$;
3) $3 - 1\frac{4}{5}$;
4) $5\frac{3}{7} - 3\frac{5}{7}$.
$3\frac{10}{17} + 4\frac{4}{17} = (3 + 4) + (\frac{10}{17} + \frac{4}{17}) = 7 + \frac{14}{17} = 7\frac{14}{17}$
$9\frac{16}{25} - 2\frac{8}{25} = (9 - 2) + (\frac{16}{25} - \frac{8}{25}) = 7 + \frac{8}{25} = 7\frac{8}{25}$
$3 - 1\frac{4}{5} = 2\frac{5}{5} - 1\frac{4}{5} = (2 - 1) + (\frac{5}{5} - \frac{4}{5}) = 1 + \frac{1}{5} = 1\frac{1}{5}$
$5\frac{3}{7} - 3\frac{5}{7} = 4\frac{10}{7} - 3\frac{5}{7} = (4 - 3) + (\frac{10}{7} - \frac{5}{7}) = 1 + \frac{5}{7} = 1\frac{5}{7}$